8b0e9c6672
Fill in the "gaps" so that all dissectors that verify checksums have both a status and expert info field. Also address comments from original proto_tree_add_checksum patch that didn't make it. Ping-Bug: 8859 Change-Id: I2e6640108fd6bb218cb959fe9e4ba98a13e43a2f Reviewed-on: https://code.wireshark.org/review/16590 Petri-Dish: Michael Mann <mmann78@netscape.net> Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org> Reviewed-by: Anders Broman <a.broman58@gmail.com>
305 lines
7.9 KiB
C
305 lines
7.9 KiB
C
/* packet-mrdisc.c 2001 Ronnie Sahlberg <See AUTHORS for email>
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* Routines for IGMP/MRDISC packet disassembly
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/*
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MRDISC
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code
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0x24 x
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0x25 x
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0x26 x
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MRDISC : IGMP Multicast Router DISCovery
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Defined in draft-ietf-idmr-igmp-mrdisc-06.txt
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TTL==1 and IP.DST==224.0.0.2 for all packets.
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/expert.h>
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#include "packet-igmp.h"
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void proto_register_mrdisc(void);
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void proto_reg_handoff_mrdisc(void);
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static int proto_mrdisc = -1;
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static int hf_checksum = -1;
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static int hf_checksum_status = -1;
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static int hf_type = -1;
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static int hf_advint = -1;
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static int hf_numopts = -1;
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static int hf_options = -1;
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static int hf_option = -1;
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static int hf_option_len = -1;
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static int hf_qi = -1;
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static int hf_rv = -1;
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static int hf_option_bytes = -1;
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static int ett_mrdisc = -1;
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static int ett_options = -1;
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static expert_field ei_checksum = EI_INIT;
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#define MC_ALL_ROUTERS 0xe0000002
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#define MRDISC_MRA 0x24
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#define MRDISC_MRS 0x25
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#define MRDISC_MRT 0x26
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static const value_string mrdisc_types[] = {
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{MRDISC_MRA, "Multicast Router Advertisement"},
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{MRDISC_MRS, "Multicast Router Solicitation"},
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{MRDISC_MRT, "Multicast Router Termination"},
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{0, NULL}
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};
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#define MRDISC_QI 0x01
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#define MRDISC_RV 0x02
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static const value_string mrdisc_options[] = {
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{MRDISC_QI, "Query Interval"},
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{MRDISC_RV, "Robustness Variable"},
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{0, NULL}
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};
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static int
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dissect_mrdisc_mra(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset)
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{
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guint16 num;
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/* Advertising Interval */
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proto_tree_add_item(parent_tree, hf_advint, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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/* checksum */
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igmp_checksum(parent_tree, tvb, hf_checksum, hf_checksum_status, &ei_checksum, pinfo, 0);
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offset += 2;
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/* skip unused bytes */
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offset += 2;
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/* number of options */
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num = tvb_get_ntohs(tvb, offset);
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proto_tree_add_uint(parent_tree, hf_numopts, tvb,
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offset, 2, num);
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offset += 2;
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/* process any options */
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while (num--) {
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proto_tree *tree;
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proto_item *item;
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guint8 type,len;
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int old_offset = offset;
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item = proto_tree_add_item(parent_tree, hf_options,
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tvb, offset, -1, ENC_NA);
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tree = proto_item_add_subtree(item, ett_options);
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type = tvb_get_guint8(tvb, offset);
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proto_tree_add_uint(tree, hf_option, tvb, offset, 1, type);
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offset += 1;
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len = tvb_get_guint8(tvb, offset);
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proto_tree_add_uint(tree, hf_option_len, tvb, offset, 1, len);
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offset += 1;
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switch (type) {
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case MRDISC_QI:
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proto_item_set_text(item,"Option: %s == %d",
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val_to_str(type, mrdisc_options, "unknown %x"),
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tvb_get_ntohs(tvb, offset));
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proto_tree_add_item(tree, hf_qi, tvb, offset, len,
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ENC_BIG_ENDIAN);
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offset += len;
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break;
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case MRDISC_RV:
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proto_item_set_text(item,"Option: %s == %d",
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val_to_str(type, mrdisc_options, "unknown %x"),
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tvb_get_ntohs(tvb, offset));
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proto_tree_add_item(tree, hf_rv, tvb, offset, len,
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ENC_BIG_ENDIAN);
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offset += len;
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break;
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default:
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proto_item_set_text(item,"Option: unknown");
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proto_tree_add_item(tree, hf_option_bytes,
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tvb, offset, len, ENC_NA);
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offset += len;
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}
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proto_item_set_len(item, offset-old_offset);
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}
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return offset;
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}
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static int
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dissect_mrdisc_mrst(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset)
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{
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/* skip reserved byte */
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offset += 1;
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/* checksum */
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igmp_checksum(parent_tree, tvb, hf_checksum, hf_checksum_status, &ei_checksum, pinfo, 0);
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offset += 2;
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return offset;
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}
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/* This function is only called from the IGMP dissector */
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static int
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dissect_mrdisc(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, void* data _U_)
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{
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proto_tree *tree;
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proto_item *item;
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guint8 type;
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int offset = 0;
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guint32 dst = g_htonl(MC_ALL_ROUTERS);
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/* Shouldn't be destined for us */
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if (memcmp(pinfo->dst.data, &dst, 4))
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return 0;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "MRDISC");
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col_clear(pinfo->cinfo, COL_INFO);
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item = proto_tree_add_item(parent_tree, proto_mrdisc, tvb, offset, 0, ENC_NA);
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tree = proto_item_add_subtree(item, ett_mrdisc);
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type = tvb_get_guint8(tvb, offset);
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col_add_str(pinfo->cinfo, COL_INFO,
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val_to_str(type, mrdisc_types,
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"Unknown Type:0x%02x"));
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/* type of command */
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proto_tree_add_uint(tree, hf_type, tvb, offset, 1, type);
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offset += 1;
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switch (type) {
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case MRDISC_MRA:
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offset = dissect_mrdisc_mra(tvb, pinfo, tree, offset);
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break;
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case MRDISC_MRS:
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case MRDISC_MRT:
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/* MRS and MRT packets looks the same */
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offset = dissect_mrdisc_mrst(tvb, pinfo, tree, offset);
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break;
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}
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return offset;
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}
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void
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proto_register_mrdisc(void)
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{
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static hf_register_info hf[] = {
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{ &hf_type,
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{ "Type", "mrdisc.type", FT_UINT8, BASE_HEX,
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VALS(mrdisc_types), 0, "MRDISC Packet Type", HFILL }},
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{ &hf_checksum,
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{ "Checksum", "mrdisc.checksum", FT_UINT16, BASE_HEX,
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NULL, 0, "MRDISC Checksum", HFILL }},
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{ &hf_checksum_status,
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{ "Checksum Status", "mrdisc.checksum.status", FT_UINT8, BASE_NONE,
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VALS(proto_checksum_vals), 0x0, NULL, HFILL }},
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{ &hf_advint,
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{ "Advertising Interval", "mrdisc.adv_int", FT_UINT8, BASE_DEC,
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NULL, 0, "MRDISC Advertising Interval in seconds", HFILL }},
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{ &hf_numopts,
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{ "Number Of Options", "mrdisc.num_opts", FT_UINT16, BASE_DEC,
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NULL, 0, "MRDISC Number Of Options", HFILL }},
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{ &hf_options,
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{ "Options", "mrdisc.options", FT_NONE, BASE_NONE,
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NULL, 0, "MRDISC Options", HFILL }},
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{ &hf_option,
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{ "Option", "mrdisc.option", FT_UINT8, BASE_DEC,
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VALS(mrdisc_options), 0, "MRDISC Option Type", HFILL }},
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{ &hf_option_len,
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{ "Length", "mrdisc.opt_len", FT_UINT8, BASE_DEC,
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NULL, 0, "MRDISC Option Length", HFILL }},
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{ &hf_qi,
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{ "Query Interval", "mrdisc.query_int", FT_UINT16, BASE_DEC,
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NULL, 0, "MRDISC Query Interval", HFILL }},
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{ &hf_rv,
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{ "Robustness Variable", "mrdisc.rob_var", FT_UINT16, BASE_DEC,
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NULL, 0, "MRDISC Robustness Variable", HFILL }},
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{ &hf_option_bytes,
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{ "Data", "mrdisc.option_data", FT_BYTES, BASE_NONE,
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NULL, 0, "MRDISC Unknown Option Data", HFILL }},
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};
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static gint *ett[] = {
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&ett_mrdisc,
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&ett_options,
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};
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static ei_register_info ei[] = {
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{ &ei_checksum, { "mrdisc.bad_checksum", PI_CHECKSUM, PI_ERROR, "Bad checksum", EXPFILL }},
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};
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expert_module_t* expert_mrdisc;
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proto_mrdisc = proto_register_protocol("Multicast Router DISCovery protocol", "MRDISC", "mrdisc");
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proto_register_field_array(proto_mrdisc, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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expert_mrdisc = expert_register_protocol(proto_mrdisc);
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expert_register_field_array(expert_mrdisc, ei, array_length(ei));
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}
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void
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proto_reg_handoff_mrdisc(void)
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{
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dissector_handle_t mrdisc_handle;
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mrdisc_handle = create_dissector_handle(dissect_mrdisc, proto_mrdisc);
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dissector_add_uint("igmp.type", IGMP_TYPE_0x24, mrdisc_handle);
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dissector_add_uint("igmp.type", IGMP_TYPE_0x25, mrdisc_handle);
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dissector_add_uint("igmp.type", IGMP_TYPE_0x26, mrdisc_handle);
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}
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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 8
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* tab-width: 8
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* indent-tabs-mode: t
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* End:
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*
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* vi: set shiftwidth=8 tabstop=8 noexpandtab:
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* :indentSize=8:tabSize=8:noTabs=false:
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*/
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